Hi there,
if anyone is looking at a cheap KPA controller.......I think a great solution is the Line6 Pod XT Live....I just bought it as
a) price for used unit is less than a standard midi controller with exp pedal
b) it's a decent backup rig in case my main KPA rig has problems
c) you can use the exp pedal for volume or for wah depending on patches
d) the wah and other fx activate when you touch the pedal and go away when you stop moving....sick, I love it!!!
Some tips for you to activate the exp pedal to control the wah
1) press the edit button and spin clockwise till the last page
2) press the soft button under "ASSIGN" and choose "1 TWEAK / 2 VOL
3) press the soft button under "TWEAK" and choose "Reverb Mix" Parameter
Now on the KPA you can choose stuff to assign to EXP1 (wah, fx, etc), and you can choose to deactivate the pedal at the heel or toe position, or when not moving the pedal (my fav setting!)